Windows 7 (beta) only: Even the earliest leaked Windows 7 betas haven't been around long enough for multi-purpose tweaking tools to come around. SetteMaxer, though, offers a few of the tweaks familiar to the customization crowd.

The screenshot above is exactly what SetteMaxer is—just a handful of check boxes and an "Apply" button. It's definitely worth reading at the project page below what specifically each feature does when applied, though most are familiar fixes like User Account Control/Defender disablers, menu speed options, and program crash controls. Still, with any tweaking utility of this type, be absolutely sure you want to make a change before you do so—some options, like "disable task scheduler," can have some serious, system-endangering punch to them.

If you see anything worth enacting in the list above, grab the executable, run it, apply the change, and you can delete it if you want, as SetteMaxer is a stand-alone file. It's a free download for Windows 7 beta systems only.